phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5436031e9835768a7cce1c3f026d4312', -1, 1711702814, 1711702814, '23af717d', -4, 0, 0)

Line : 187
File : sessions.php